Wideband O2 / Dyno Question
#1
Wideband O2 / Dyno Question
Hey guys, I am looking to buy some Hi flow Cats in the near future. I have a question. When you dyno and get a wideband O2 reading the best place to get this from is pre cats right? This would make me think I need some o2 bungs welded onto my new cats. The question is do you put sensors in the bungs that the dyno plugs up to, or do you plug them up and the shop puts in sensors that come with the dyno?
#3
Registered User
iTrader: (8)
Join Date: Jun 2003
Location: Nor Cal.
Posts: 1,635
Likes: 0
Received 0 Likes
on
0 Posts
Re: Wideband O2 / Dyno Question
Originally posted by alininger2001
Hey guys, I am looking to buy some Hi flow Cats in the near future. I have a question. When you dyno and get a wideband O2 reading the best place to get this from is pre cats right? This would make me think I need some o2 bungs welded onto my new cats. The question is do you put sensors in the bungs that the dyno plugs up to, or do you plug them up and the shop puts in sensors that come with the dyno?
Hey guys, I am looking to buy some Hi flow Cats in the near future. I have a question. When you dyno and get a wideband O2 reading the best place to get this from is pre cats right? This would make me think I need some o2 bungs welded onto my new cats. The question is do you put sensors in the bungs that the dyno plugs up to, or do you plug them up and the shop puts in sensors that come with the dyno?
FYI , if you buy crawford CATs the best.easiest place to weld in an O2 bung is "Pre-CAT on the Passenger side". The CAT shield needs to be trimmed back a little , but it will fit. Pretty similar story with Kinetix CATS, but with Kinetix there is a little easier since the CAT sits back further from the front flange.
#4
Someone at my shop answered it for me. It's best to do the readings pre cat. What you do is have bungs welded onto the cats (right after the header) They uncap the bungs put in their sensors, and take the readings, makes sense to me. How would the car run right if you take out an o2 sensor?
#5
Registered User
iTrader: (8)
Join Date: Jun 2003
Location: Nor Cal.
Posts: 1,635
Likes: 0
Received 0 Likes
on
0 Posts
o2
Originally posted by alininger2001
Someone at my shop answered it for me. It's best to do the readings pre cat. What you do is have bungs welded onto the cats (right after the header) They uncap the bungs put in their sensors, and take the readings, makes sense to me. How would the car run right if you take out an o2 sensor?
Someone at my shop answered it for me. It's best to do the readings pre cat. What you do is have bungs welded onto the cats (right after the header) They uncap the bungs put in their sensors, and take the readings, makes sense to me. How would the car run right if you take out an o2 sensor?
All OEM O2 sensors should remain intact for tuning.
#7
Vendor - Former Vendor
iTrader: (512)
Originally posted by alininger2001
I thought he meant they take out a stock sensor(if the bung wasn't present) Do you only need one bung. Would it be better to have two? Is it possible to have two?
I thought he meant they take out a stock sensor(if the bung wasn't present) Do you only need one bung. Would it be better to have two? Is it possible to have two?
Trending Topics
#8
Registered User
iTrader: (8)
Join Date: Jun 2003
Location: Nor Cal.
Posts: 1,635
Likes: 0
Received 0 Likes
on
0 Posts
Bung
Originally posted by Kyle(Houston)
It is only possible to read one side at a time on the dyno. I recommend doing the bung on the driver side since #6 cylinder is the rear cylinder and usually runs the hottest.
It is only possible to read one side at a time on the dyno. I recommend doing the bung on the driver side since #6 cylinder is the rear cylinder and usually runs the hottest.
#9
Registered User
iTrader: (7)
Join Date: Apr 2003
Location: Williamsburg Va
Posts: 1,356
Likes: 0
Received 0 Likes
on
0 Posts
Yes, I did mean take the stock sensor out. Unless you plan on doing a lot of dynos it is not worth the time to have a bung welded in. The reason is the ecu is in open loop and the oxygen sensor is not being read.
The car is in open loop when deceleration, acceleration, high load, high speed, malfunction of o2, low o2 temperature, High engine coolant temps, and when starting.
So running the car on the dyno will not be effected by not having the o2 out or in.
The car is in open loop when deceleration, acceleration, high load, high speed, malfunction of o2, low o2 temperature, High engine coolant temps, and when starting.
So running the car on the dyno will not be effected by not having the o2 out or in.
#11
Registered User
iTrader: (8)
Join Date: Jun 2003
Location: Nor Cal.
Posts: 1,635
Likes: 0
Received 0 Likes
on
0 Posts
Bung
Originally posted by alininger2001
Thanks for the info guys.
Thanks for the info guys.
Thread
Thread Starter
Forum
Replies
Last Post